Played 3.5 hours MP with one human over Internet. Both using Insiders Edition V 1.89, with Sept 25th update.
Skirmish game with Starburst parameter.
Game froze on 'Turn Starting' every second turn or so. A Debug directory would flash up on my screen briefly, showing debug files, overlaying the game display.
Sometime we would get a pop-up window with a Checksum Error message. We would have to exit the game and load the last saved or auto-saved game and continue to play.
I found three files, with current date and time, in the game Debug folder:
I can upload these to you, if you let me know how to do so. Thanks.

Update. After we humans finished our MP session, I continued to play the MP game, with the former Human player set to AI control.
I did play another six turns with no crashes at all.